.mc-calculator{
  max-width:760px;
  background:#f5f5f5;
  color:#111;
  padding:14px;
  border-radius:12px;
  font-family:system-ui;
  border:1px solid #ddd;
}

.mc-display{
  background:#fff;
  border:2px solid #3b82f6;
  border-radius:10px;
  padding:10px;
  margin-bottom:12px;
}

.mc-expression{
  font-size:16px;
  color:#666;
  min-height:22px;
  text-align:right;
}

.mc-result{
  font-size:30px;
  font-weight:bold;
  text-align:right;
  color:#111;
}

.mc-grid{
  display:grid;
  grid-template-columns:repeat(7,1fr);
  gap:10px;
}

.mc-grid button{
  height:46px;
  border-radius:10px;
  border:1px solid #d0d0d0;
  font-size:15px;
  background:#ffffff;
  color:#111;
  cursor:pointer;
}

.mc-grid button:hover{
  background:#eef2ff;
}

.mc-grid button:nth-child(-n+3){
  background:#f2e2e2;
  color:#7a1f1f;
}

.mc-eval{
  background:#2563eb !important;
  color:#fff !important;
  font-weight:bold;
}

.mc-back,.mc-clear{
  background:#e5e7eb;
}

.mc-clear{
  background:#ef4444 !important;
  color:#fff !important;
  border-color:#dc2626 !important;
}